Report updated May 19, 2026
Modulus Calculator
For general Android users requiring a multi-functional utility tool for daily mathematical, financial, and unit conversion tasks.
Modulus Calculator is an established utilities app that is completely free. With a 4.3/5 rating from 367.1K reviews, it shows polarized user reception. Users particularly appreciate the lightweight design and fast calculation speed provide a reliable experience for daily math tasks, though calculation errors and cursor jumping during long sequences frustrate users performing complex daily financial tallies remains a common concern.
What is Modulus Calculator?
Modulus Calculator is a multi-functional utility app for Android that bundles scientific, financial, and unit-conversion tools into a single interface.
Users hire this app to consolidate disparate daily calculation tasks into one lightweight tool, reducing the need for multiple specialized applications.
Current Momentum
v1.0 · 38mo ago
Zombie- Ships general bug fixes only.
- Maintains broad Android hardware support.
Active Nemesis
Calculator₊
By Impala Studios
Other Rivals
Rating Pulse 🇺🇸
Recent User MoodAI-powered deep analysis surfacing high-signal insights. Still in beta, accuracy improves daily. For informational purposes only.
What makes this app unique?
What Does It Look Like?
How Is The App's Momentum Right Now?
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What Are The Key Features?
Bundles regular, scientific, mortgage, age, BMI, discount, and date calculators into a single interface.
Provides exchange rate conversions with daily updates.
Calculates goods and services tax specifically for the Indian market.
How much does it cost?
- Free, ad-supported
The app operates as a free, ad-supported utility with no IAP or subscription gates, prioritizing massive user acquisition across the Android ecosystem.
Who Built It?
Theodore Dubois
Providing specialized open-source utilities and developer tools for technical power users and academic niches.
Portfolio
3
Apps
Who is Theodore Dubois?
Theodore Dubois occupies a distinct niche by delivering high-utility, open-source tools that solve specific technical constraints, such as running Linux environments on iOS. The portfolio operates on a community-utility model rather than a commercial one, prioritizing functional depth over monetization or broad market appeal. Current signals indicate a transition into a legacy phase, as the entire portfolio lacks recent development activity despite maintaining a strong reputation among power users.
Who is Theodore Dubois for?
- Developers
- Mathematics students
- Niche language enthusiasts seeking specialized functional tools
Portfolio momentum
The portfolio is currently stagnant with zero releases in the last 6 months and all three titles classified as abandoned.
What other apps does Theodore Dubois make?
What do users think recently?
Low confidence · 53 reviews analyzed · Based on 53 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a mixed sentiment. Users appreciate the lightweight design and fast calculation speed provide a reliable experience for daily math tasks, but report calculation errors and cursor jumping during long sequences frustrate users performing complex daily financial tallies.
What Users Love
What Frustrates Users
What Users Want
What is the competitive landscape for Modulus Calculator?
How's The Utilities Market?
Market outlook for this category
Available very soon
The rivals identified
The Nemesis
Head to Head
The target app must pivot toward a specialized utility niche or power-user feature set to avoid being completely overshadowed by the scale and update velocity of this incumbent.
What sets Modulus Calculator apart
Offers a more streamlined, lightweight interface that avoids the feature bloat found in legacy calculators.
Provides better cross-platform consistency for users transitioning between Android and iOS ecosystems.
What's Calculator₊'s Edge
Aggressive release schedule ensures constant feature parity with the latest iOS design language and APIs.
Massive user base provides a data-driven feedback loop that informs rapid, iterative product improvements.
Contenders
Deep system-level integration allows for immediate access via Control Center and lock screen widgets.
Zero-friction user experience as the default pre-installed utility for all iOS device owners.
Focuses on a minimalist design language that appeals to users overwhelmed by multi-purpose calculator suites.
Maintains a stable, predictable feature set that prioritizes core arithmetic over complex unit conversions.
Peers
CalcKit
★4.8 (12.9K)Akkyra Systems
A feature-rich alternative that bridges the gap between basic calculation and advanced scientific/unit conversion needs.
Includes an extensive library of specialized unit conversions that far exceeds the target app's basic capabilities.
Provides a highly customizable interface allowing users to pin frequently used formulas to the main screen.
Currency Converter Plus Live
★4.8 (4.8K)DigitAlchemy LLC
Targets the specific subset of the utility market focused on real-time financial data and travel-related conversions.
Integrates live market data feeds, providing a significant advantage over static or manual conversion tools.
Optimized for travel-centric workflows, including offline mode support for users without reliable data roaming.
New Kids on the Block
Mortgage Calculator・
★4.8 (72)Andy Sutanto
A recent entrant focusing on a high-intent financial niche, showing rapid growth potential in the last year.
Provides specialized amortization scheduling that general-purpose calculators fail to visualize effectively for homeowners.
Uses a simplified input flow specifically designed for mortgage scenarios rather than generic mathematical operations.
The outtake for Modulus Calculator
Strengths to defend, gaps to attack
Core Strengths
- Regional GST calculator functions as a B2B distribution moat in India
- Broad hardware optimization maximizes Android install base
Critical Frictions
- Cursor-stability bugs in long sequences erode trust
- Dark mode contrast issues force unnecessary app restarts
- 0.47★ Android-iOS rating gap
Growth Levers
- Untapped B2B partnerships in education
- Integration of advanced loan/EMI modules to satisfy high-intent financial users
Market Threats
- High-velocity release cadence of Calculator₊
- Native system-level integration of Apple's Calculator
- Technical regressions on flagship hardware
What are the next best moves?
Rebuild cursor logic because calculation errors are the top complaint → stabilize long-sequence financial tallies
Cursor jumping and calculation errors are the primary frustration theme in user reviews.
Trade-off: Push the loan/EMI module sprint to Q3 — stability is a prerequisite for financial utility.
Audit dark mode contrast because visibility issues force app restarts → improve session retention
Users report gray-on-dark text is unreadable, forcing them to minimize and reopen the app.
Trade-off: Same-quarter capacity available — no major lever displaced.
A counter-intuitive read
The app's maintenance-mode status is a strategic asset, as it avoids the feature bloat that plagues incumbents and keeps the interface lightweight for the core Android user base.
Feature Gaps vs Competitors
- Real-time market data feeds (available in Currency Converter Plus Live but absent here)
- Specialized amortization scheduling (available in Mortgage Calculator・ but absent here)
Key Takeaways
Modulus Calculator holds its category lead through sticky regional features like the GST calculator, but technical regressions erode trust, so revenue growth hinges on stabilizing the core arithmetic engine.
Where Is It Heading?
Mixed Signals
The utility market is consolidating around high-frequency update cycles, leaving apps in maintenance mode like Modulus Calculator exposed to specialized rivals. The subject app must pivot toward advanced financial modules to retain power users, or it will lose its chart position to entrants with better amortization visualization.
Technical regressions on flagship hardware (failing icons, load errors) erode trust among high-value users, which compounds the rating drag already visible on Android.
Regional localization (GST calculator) secures a defensible B2B distribution barrier in India, which protects the app from generic global utility competitors.